A/B Loop
A/B Loop lets you mark two points in the timeline and repeat the section between them continuously. All protocol outputs loop in sync with the audio — no separate configuration is needed on receiving devices.
Setting loop points
- Set Loop A (start) — press
[or click the A button in the transport while the playhead is at the desired start position - Set Loop B (end) — press
]or click the B button while the playhead is at the desired end position
You can set A and B while the transport is playing or stopped. Setting A while playing marks the current playback position. Setting B while playing marks the position at the moment you press the key.
Loop A and B do not need to be set in order — you can set B before A if that is easier during a fast rehearsal pass.
Active looping
Once both A and B are set, the transport loops. Behavior during looping:
- Playback reaches the B point and immediately jumps back to the A point without stopping
- LTC audio resets to the A timecode address on each loop cycle
- MTC sends a Full Frame locate message at the loop-back point
- Art-Net and OSC update to the A position on each loop
- The loop region is shown as a highlighted band on the waveform
Clearing the loop
- Press
[while the loop is active — this clears both the A and B points and disables looping - Click Clear Loop in the transport controls
- Clicking the A button again while looping is active also clears the loop
After clearing, playback continues from the current position without looping.
Saving loop points
Loop A and B positions are saved with the project file. When you reopen a .ltcast file, the loop markers are restored to their saved positions. This makes it easy to set up rehearsal loops during preparation and recall them at the venue.